#include <stdio.h>
#include <string.h>

int main() {
    char s1[100] = "china";
    char s2[100];
    char s3[100] = "How ";

    // s2 = s1; // 不能直接赋值
    strcpy(s2, s1);
    printf("s2 = %s\n", s2);

    // s3 = s3 + s1;
    strcat(s3, s1);
    printf("s3 = %s\n", s3);

    return 0;
}